Many TP-Link routers can be accessed by entering tplinkwifi.net or the IP address 192.168.0.1 or 192.168.1.1 in your web browser's address bar. If you arrived here, you probably made a small spelling mistake in the address.
Please make sure you are connected to your TP-Link router's Wi-Fi network before trying to log in. If you still have trouble, check your router's manual or the label on the device for the correct login address.